With this book, we are aiming to provide answers to three essential questions: what are Knowledge Graphs, how are they built and accessed, and why are they important? We elaborated on several possible definitions of Knowledge Graphs and identified as core feature the extremely large amount of interlinked data they try to turn into knowledge. This significantly exceeds any traditional AI approach. We described in detail several approaches for constructing, hosting, curating, and deploying Knowledge Graphs, and we showed their usage for dialog-based information access that revolutionizes information access by humans. We described applications in the areas of e-tourism and beyond.
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